End of suggestion (3)
I believe the answer is:
tip
I believe this is a double definition.
'end' is the first definition.
(I know that tip is a type of end)
'suggestion' is the second definition.
(tip is a kind of suggestion)
'of' acts as a link.
(Other definitions for tip that I've seen before include "Hint about a horse" , "Give the likely winner for gratuity" , "Piece of useful advice" , "Gratuity; rubbish-dump" , "Grtatuity" .)